Packing-ring for pistons



(No Model.)

W. W. ST. JOHN.

PACKING RING FOR PISTONS.

No. 360,121. Patented Mar. 29, 1887.

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PATENT \VILLIAM \V. ST. JOHN, OF BROOKLYN, NIMV YORK.

PACKING-RING FOR PISTONS.

SPECIFICATION forming part of Letters Patent No. 360,121, dated March 29, 1887.

Application filed Otoher 29, 1856. Serial No. 217,517. (No model.)

To all whom it may concern:

Be it known that I, WILLLQT'W. Sr. Jonn, a citizen of the United States, residing at Brooklyn, in the State of New York, have invented certain new and useful. Improvements in Packing-Rings for-Pistons; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in packing-rings for pistons, and the object is to produce a packing-ring for pistons by which the piston will be packed perfectly tight; also, that the ring will wear in such manner that the face of the-ring bearing against the inner surface of the cylinder and the bearing or vertical side of the ring placed against the pistonbody shall wear in a proportionate manner, and so that the vertical side shall have a slightly greater surface than the face side; furthermore, that the outer side having a bevel surface be acted on by the steam, so as to force the ring outward and said bevel form a line eitending from the two opposite corners, (more or less,) and also form a small shoulder.

My invention consists of a packing-ring of a rectangular cross-section, having a bevel side extending about half the depth and half 'the width of the ring, and a line drawn through said bevel passing through the two opposite corners of the ring, or nearly so.

It also consists in the construction of certain details and arrangement of parts, as will be more full y described hereinafter, reference being had to the accompanying drawings and the letters of reference marked thereon.

'Like letters indicate similar parts in the different figures, in which Figure l is a plan view of a piston, with the ring applied, in position. Fig. 2 is a cross section ofFig. 1. Fig. 3 is a modification of Fig. 2. Fig. 4 is a detail sectional View of the ring. Fig. 5 is a modification of Fig. 4.

In the drawings, A represents the body of the piston, to which the piston-rod is secured, and having a groove, a, on each side, in which the packingrings B are placed. These rings are out only at one point, which is placed at the lower side of the piston in horizontallyworking engines, and a pin, 0,-having an enlarged T-head, is placed in a suitable hole in the piston-body at the point out, to prevent the ring from turning on the piston. The rings B are of a rectangular shape, having the vertical side which bears against the body of the piston made of slightly greater depth than the face of the ring bearing against the inner surface of the cylinder. The outer side of the ring is beveled, as shown at b, and has asmall shoulder, although not necessary. A line drawn through the two opposite corners of the ring on thebevel will give the proper relative proportions of the vertical and face sides, so that they will always wear alike. Said line may, however, vary a little to one side or the other.

In Fig. 3 the rings are held in place by the followers D, and the piston is made hollow, instead of solid.

In vertical engines ajoint-piece is used, instead of the pin at the joint.

The operation is as follows: The rings are first sprung into the grooves a and the pin inserted in its hole in the piston-body to prevent the ring from revolving. The steamprcssure in the cylinder will then force the rings out against the inner diameter of the cylinder by first pressing against the beveled sides, and the steam will then pass under the inner diameter of the ring, as well as against the sides of the ring, and force it against the body of the piston, thereby preventing any leakage.

It will be readily understood that the surface of the ycrtical side being greater than the face side, the steam thus has a greater area to press it against the body of the piston, and pressing against the bevel surface the ring will be always packed against the inner surface of the cylinder, in whatever direction'the piston is traveling.

Having thus described my invention, what" I claim, and desire to secure by Letters Patent, 1s

1. In a piston, a packing-ring cut at one side only having its outer side beveled, so that the side bearing against the inner surface of the cylinder and the side bearing against the body of the piston shall wearin proportionate degree, substantially as specified.

2. In a piston, a packing-ring out only at one point and having a cross-section whose vertical side bearing against the piston-body 4. In pistons, a packing-ring having the is greater in width than the face side bearing side placed toward the piston-body of greater against the inner surface of the cylinder, and depth than its face side, andits outer side bevhaving its outer upper side beveled, as shown,

5 and for the purpose set forth.

' 3. In apiston, apacking-ringhavingacrosssection whose side bearing against the pistonbody is of greater width than its face side bearing against the surface of the cylinder,

10 and having its side beveled, as shown, and

provided with a shoulder, as set forth.

eled, in combination with a pin having a head, 15 as and for the purpose specified.

In testimony whereof I hereby affix my signaturein presence of two witnesses.

v WVILLIAM WV. ST. JOHN.

\Vitnesses:

F. V. BRooKs, B. LEWIS BLACKFORD. 

